yll Am

yll Am

Peculiar star whose metallic lines are as strong as those of the F stars but whose hydrogen lines are so strong as to require that they be classed with the A stars. They are generally short-period (<300d) spectroscopic binaries with high atmospheric turbulence and variable spectra, and are slower rotators than normal A stars.

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Del af tale: noun
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Branche/domæne: Astronomy
Category: General astronomy
Company: Caltech
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